Anemones are marine animals belonging to the phylum Cnidaria, closely related to corals and jellyfish. They are typically characterized by their colorful, flower-like appearance and tentacles, which contain specialized cells called nematocysts for capturing prey. Anemones are often found in symbiotic relationships with clownfish, providing protection for the fish while benefiting from nutrients in return. They can be found in various marine environments, from shallow coastal waters to deeper ocean floors.